Headphones don't work? Help please...

Sure no problem,

Headphones were plugged in and sound was fine in mail app, garagband, etc…

Then I bought Cubasis and installed…

Started using the draft Cubasis project with an acoustic piano track and recorded some keys…I saw the midi notes being laid down but could not hear as I played and during playback. I then unplugged my phones and the sound started coming from the iPAD speakers. I couldn’t figure out what could be the issue from there. Plugged and unplugged my phones several times with sound disappearing and reappearing. Closed the Cubasis app and opened garageband, sound played fine through the phones then. Closed garageband and opened Cubasis again, then same problem happened.

Also, I think Audiobus may have been running in the background but can’t remember now that I am at work. Thanks